RUTC50 / RutOS 7.22.1: VoLTE set to Off in WebUI/API, but modem IMS remains enabled

Networking Solutions Issue
1

Device: RUTC50
Firmware: RUTC_R_00.07.22.1
Modem: Quectel RG520N-EBDC
Carrier: Vodafone Germany

Problem:
WebUI and API show VoLTE = Off, but the modem runtime still reports IMS enabled.

Evidence:

  • WebUI: VoLTE Off
  • API config: VoLTE Off
  • CLI command:
    gsmctl -A ‘AT+QCFG=“ims”’
    returns:
    +QCFG: “ims”,1,0

This means the configured VoLTE state does not match the actual modem IMS state.

Additional note:
The issue was first noticed after updating to firmware 7.22.1.
It is not yet verified whether the same behavior was also present on 7.21.3.

Observed behavior:

  • WebUI/API indicate VoLTE is disabled
  • modem runtime still keeps IMS enabled
  • this suggests a config/runtime mismatch or that the setting is not correctly applied to the modem

Can Teltonika confirm whether this is a known RutOS 7.22.1 issue on RUTC50 / RG520N-EBDC?

3

Hello,

For troubleshooting purposes, we will require more sensitive information from your end, such as the troubleshoot file, which may contain passwords, public IP addresses, serial numbers, and such. To avoid leaking this information, we have sent you a form to fill out, which you will receive in your e-mail inbox that you have registered your account with in the forums. In the Ticket ID field of the form, please enter the ID of this thread, which is 18985.

Please let me know once you filled out the form.

Thank you,
V.